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US 7,144,362 B2Granted
Method for chemically stabilizing waste materials containing multivalent oxyanions
AssigneeHeritage Environmental Servicers, LLC
InventorRalph E. Roper, Jr.
Life of this patent
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Abstract
A method of chemically stabilizing multivalent oxyanions in residue materials such as wastes from glass manufacturing facilities which method involves adding to the residue material cement, lime and aluminum sulfate to form a clay-like material having a low leachability and permeability to water. Calcium polysulfide or other sulfide bearing materials can also be added to assist in stabilizing multivalent oxyanions by adjusting the oxidation-reduction potential of the stabilized waste matrix.
Claims7
A method for chemically stabilizing multivalent selenium oxyanions in a residue material which comprises:
- providing a residue material containing at least 1 wt. % selenium oxyanions;
- and
- adding to the residue material reagents to form a clay-like material having a TCLP leachability of selenium that is less than 10 mg/L that is suitable for landfill disposal, said reagents consisting essentially of portland cement, lime and aluminum sulfate.
Dependencies are inferred from the claim text.